Caracterización de las facies sedimentarias del ambiente fluvial de la formación Río Playas en la Cuenca de Yamana

Abstract

Abstract: The Río Playas Formation outcrops in the Río Playas basin in the Yamana sector, it presents a sedimentary composition of Early Eocene age; It is made up of a sequence of sandstone strata of medium to fine grain, the materials contain a high contribution of silica, with a varied composition in its matrix and lithics, because the Río Playas Formation is made up of relics of the Formations that it precede; the petrographic analysis of the clasts in the conglomerates shows a distant origin from the source of contribution. Most of the accumulations have been transported by fluvial mechanisms with contributions of sediments from various sources, possibly in a humid temperate environment. The analyzes: petrographic, fossiliferous, thin sheets, X-ray fluorescence, X-ray diffraction, have allowed to characterize the materials in two groups of rocks: group I sandstones of continental and marine contributions with less contribution of silica; group II sandstones with continental contributions of fluvial origin with greater contribution of silica.